Systematics/Phytogeography / Taxonomie/ Section
Sytsma, Kenneth J. , Drew, Bryan T. , Walker, Jay B. , Schönenberger, Jürg , Anderberg, Arne A. , Judd, Walter S. .
Evolution in Ericales: Fossil calibration and character evolution under a Bayesian framework.
Phylogenetic relationships within the Ericales have been examined using multiple genes from nuclear, chloroplast, and mitochondrial genomes. We present the latest phylogenetic trees resulting from MP, ML, and Bayesian analyses using 22 genes and nearly 100 species representing all major groupings except for the holoparasite Mitrastema (Mitrastemonaceae). Relationships are largely resolved with the inclusion of more taxa and genes. To address issues of temporal and character evolution within the order, a Bayesian framework analysis was used implementing BayesTraits and BEAST and compared to results from other tools (e.g., ML in r8s and BayesTraits). Five fossils internal to Ericales as well as various fixed ages for the asterid root were used. We explored various sources of error including bounds on fossil dates, placement of fossils, exclusion of some fossils, bootstrapping the data set, and sets of likely tree topologies (MP or Bayesian). Despite differences resulting from various error sources, the order appears to have diversified rapidly in the late Albian and Cenomanian. A number of critical characters, typically defining most rosids or asterids but varying within Ericales, were examined with BayesMultiState and Discrete. Sympetaly, endosperm formation, and integument number exhibit more complicated evolutionary histories, are examined in detail under ML and Bayesian contexts and compared to MP reconstructions, and tested for correlative evolution.
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1 - University of Wisconsin Madison, Department of Botany, Birge Hall, 430 Lincoln Drive, Madison, Wisconsin, 53706-1381, USA
2 - University of Wisconsin-Madison, Botany, 430 Lincoln Drive, Madison, WI, 53706-1381, USA
3 - University of Wisconsin, Madison, Department of Botany, Birge Hall, 430 Lincoln Drive, Madison, Wisconsin, 53706-1381, USA
4 - Stockholm University, Department of Botany, Lilla Frescativägen 5, Stockholm, SE-10691, Sweden
5 - Swedish Museum of Natural History, Department of Phanerogamic Botany, P.O. Box 50007, Stockholm, SE-104 05, Sweden
6 - University of Florida, Department of Botany, 220 Bartram Hall, P.O. Box 118526, Gainesville, Florida, 32611-8526, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Room 3/Woodward
Date: Monday, July 28th, 2008
Time: 2:15 PM